vocd

alternative VOCD · alternative VocD · alternative vocD

1. uncountablecorpus linguisticsA measure of the lexical diversity of a given corpus, determined by comparing the sizes of steadily larger random samples from the corpus against their respective type-token ratios.

   A paired sample t-test was conducted and results indicated no significant differences between vocd scores for younger and older participants, t(29) = 1.154, p = .253.

   2016, Stephen Kintz, Heather Harris Wright, “Semantic Knowledge Use in Discourse: Influence of Age”, in Discourse Processes, volume 54, →DOI, page 7

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   The VOCD command was written by Gerard McKee of the Department of Computer Science, The University of Reading. [...] The complete description of VOCD can be found in: Malvern, D., Richards, B., Chipere, N., & Purán, P. (2004).

   2000–2023, Brian MacWhinney, The CHILDES Project: Tools for Analyzing Talk, 3rd edition, Mahwah, NJ: Lawrence Erlbaum Associates, →DOI, archived from the original on 27 Jul 2023, page 110

   A recently developed index of lexical diversity, vocD, uses repeated calculations of the type–token ratio (TTR) over a range of tokens to show how the TTR varies in relation to sample size. […] Owen and Leonard (2002) found that children with SLI between the ages of 3 and 7 had lower scores on vocD based on 100 utterances than age-matched, typically developing comparison children […]

   2008, Eliza Carlson Lee, Leslie Rescorla, “The Use of Psychological State Words By Late Talkers at Ages 3, 4 and 5 Years”, in Applied Psycholinguistics, volume 29, →DOI, page 23

   To calculate a VOCD, words from a corpus are randomly sampled, in increasing sample sizes. The resultant curve relating sample size and type-token ratio is plotted, and a value is fit to a segment of that curve.

   2018, Jessica L. Montag, Michael N. Jones, Linda B. Smith, “Quantity and Diversity: Simulating Early Word Learning Environments”, in Cognitive Science, volume 42, number 52, →DOI, page 380